Author：Baby & Adult Diaper Materials FROM：Diaper Materials Manufacturer TIME：2023-04-18
When it comes to choosing diapers, many novice parents rely on experience, brands or recommendations from friends to choose, but they know little about the professional standards of diapers. In fact, every layer of a high-quality diaper has a "breathable" design, and there is it-diaper film, that is, diapers film. What is a breathable backsheet? The bottom material of diapers is generally made of PE film or PE film + non-woven fabric. PE film has good water resistance and air permeability, mainly to prevent urine leakage and make diapers breathable and impervious to water; While ensuring the breathability of the diapers, the comfort of the baby is improved as much as possible, so that the diapers are more textured and feel better.The diapers film we often say is the outermost layer with patterns. Diapers film, on the one hand, prevents the baby's urine from penetrating to the outside, on the other hand, it has good air permeability, plays the role of releasing stuffy air, and helps prevent the occurrence of baby's red butt. The operating principle of diapers film is very simple: inorganic matter + stretching = microporous. In fact, the operation is very particular, and only the micropores with appropriate size and uniform distribution are effective. When the water vapor concentration on one side of the membrane is greater than the environment on the other side of the membrane, a humidity gradient pressure difference is formed. And this provides the basic conditions for gas (steam) convection. Due to the formation of convection, the humidity environment on both sides of the film tends to be relatively balanced. This is the basic principle of how breathable backsheets work. Secondly, in addition to being breathable, diapers film is also used as a water barrier film, which has a barrier effect on liquids. Because of the many channels in the film, the tortuous channel formed by it has a large "length-to-diameter ratio" (L/D), which can be understood as a capillary. Therefore, under the same liquid (such as water) and the same pressure, as long as the height of the liquid column of the capillary is smaller than the length of the capillary, it can be guaranteed that the liquid will not leak out, otherwise the liquid will leak.
At present, the diaper film on the market is generally divided into three types of materials: hot air bottom film, cotton soft bottom film, and super soft bottom film.
a. Hot air bottom film: it can play a better role in ventilation and relieve the feeling of stuffiness. The heat-separated bottom film adopts the hot air bonding process, that is, the hot air is used to penetrate the fiber web on the drying equipment to heat and melt it to produce bonding, so that the bottom film of the diaper has high bulkiness, good elasticity and soft hand feeling. , strong warmth retention, good air permeability and water permeability.
b. Cotton soft bottom film: Cotton fiber absorbs the baby's sweat and directly contacts the baby's skin, making the baby feel soft but not stiff. Although it is very soft and not easy to get wet, it is easy to wrinkle and deform, and when the absorption reaches a saturation level, the air permeability will be greatly reduced.
c. Super soft bottom film: it has the characteristics of fine hair surface, warm and smooth. Although it feels soft and thick, it is easy to deform and wrinkle after absorbing too much urine from the baby.
Technology of breathable bottom film in diapers To judge the air permeability of the bottom film of diapers, in addition to the number of air holes in the breathable bottom film, it is also necessary to pay attention to its manufacturing process. The main things to pay attention to are colloids, including urine gel and structural glue.Due to the small amount of structural adhesive used, there is currently no obvious data showing that it is harmful to the human body. It just smells like a smell, and sometimes smells like diapers, which may be the smell of the breathable membrane. Moreover, the taste of diapers is determined by many factors, not just the breathable membrane.
The urine gel is mainly reflected in the urine display process of diapers. At present, most of the diapers on the market use hot-melt urine-discovering glue technology, which is relatively mature.The last thing to say is that when choosing diapers, you must not only look at the material, but also pay attention to the craftsmanship of each structure. Take the diaper film as an example. It must be breathable and waterproof, and the material should be soft and not too hard, so as to take better care of the baby's buttocks.
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